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Engagement Control of Automotive Clutch by Mechatronic System Using Pre-determined Force Trajectories

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Abstract

In automated manual clutch (AMC), the mechatronic system is required to generate appropriate clutch force trajectory to achieve good engagement quality. For this purpose, four generic force trajectories were analyzed and engagement quality was assessed, using four parameters—peak engine speed, clutch lockup time, vehicle lurch, and shuffle. Magnitudes of these parameters were obtained from results of simulation on a complete dynamic model of vehicle driveline. It was observed that parabolic trajectory gives satisfactory overall performance in terms of engagement quality, but results into higher lurch. However, it can be modified further to reduce lurch. A set of such trajectories may be obtained for different driving conditions, for use in mechatronic system, for control of AMC. This approach is an alternative to costlier and more difficult method of real-time control of force trajectory during clutch engagement. Schematic implementation of proposed mechatronic system, with driver interface, is also outlined in this work.

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Abbreviations

m v :

Vehicle mass

m w :

Wheel mass

t :

Time elapsed since commencement of engagement operation

t r :

Clutch release time (duration of clutch release)

x :

Linear displacement of vehicle

B cg :

Torsional damping coefficient of clutch output shaft bearing

B ec :

Torsional damping coefficient of crankshaft bearing

B gw :

Torsional damping coefficient of transmission shaft bearing

F a (t):

Instantaneous axial force on clutch plate

F max a :

Maximum normal force of clutch plate (nominal clutch force)

F d :

Drag force on vehicle

F 0 :

Starting force of wheel

G :

Overall gear ratio of gearbox and differential

J c1 :

Moment of inertia of clutch friction disc

J c2 :

Moment of inertia of clutch pressure plate

J e :

Moment of inertia of flywheel and crankshaft

J g1 :

Moment of inertia of input gear

J g2 :

Moment of inertia of output gear

J wc :

Moment of inertia of wheel about its axis

J wo :

Moment of inertia of wheel about its axis

K cg :

Torsional stiffness of clutch output shaft

K ec :

Torsional stiffness of crankshaft

K gw :

Torsional stiffness of transmission shaft

R w :

Wheel radius

R 1 :

Pitch radius of input gear

R 2 :

Pitch radius of output gear

T c :

Friction torque transmitted by clutch

T 1 :

Torque on input gear

T 2 :

Torque on output gear

T ec :

Torque transmitted by clutch input shaft

T gw :

Torque transmitted by transmission shaft

θ e :

Angular rotation of flywheel

θ c1 :

Angular rotation of clutch friction disc

θ c2 :

Angular rotation of clutch pressure plate assembly

θ g1 :

Angular rotation of input gear of gearbox

θ g2 :

Angular rotation of output gear of gearbox

θ w :

Angular rotation of wheel

μ c :

Coefficient of friction of clutch friction surface

μ w :

Coefficient of friction between wheel and ground

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Authors and Affiliations

  1. Mechanical Engineering Department, Shri G.S. Institute of Science and Technology, Indore, 452 003, MP, India

    K. Tripathi

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  1. K. Tripathi
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Tripathi, K. Engagement Control of Automotive Clutch by Mechatronic System Using Pre-determined Force Trajectories. J. Inst. Eng. India Ser. C 95, 109–117 (2014). https://doi.org/10.1007/s40032-014-0113-5

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  • DOI: https://doi.org/10.1007/s40032-014-0113-5

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